Dirac state in a centrosymmetric superconductor α−PdBi2
Klauss Dimitri, M. Mofazzel Hosen, Gyanendra Dhakal, Hongchul Choi, Firoza Kabir, Christopher Sims, Dariusz Kaczorowski, Tomasz Durakiewicz, Jian-Xin Zhu, Madhab Neupane
DOI 10.1103/PhysRevB.97.144514 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Topological superconductor (TSC) hosting Majorana fermions has been established as a milestone that may shift our scientific trajectory from research to applications in topological quantum computing. Recently, superconducting Pd-Bi binaries have attracted great attention as a possible medium for the TSC phase as a result of their large spin-orbit coupling strength. Here, we report a systematic high-resolution angle-resolved photoemission spectroscopy (ARPES) study on the normal state electronic structure of superconducting α−PdBi2(Tc=1.7 K). Our results show the presence of Dirac states at higher-binding energy with the location of the Dirac point at 1.26 eV below the chemical potential at the zone center. Furthermore, the ARPES data indicate multiple band crossings at the chemical potential, consistent with the metallic behavior of α−PdBi2. Our detailed experimental studies are complemented by first-principles calculations, which reveal the presence of surface Rashba states residing in the vicinity of the chemical potential. The obtained results provide an opportunity to investigate the relationship between superconductivity, topology, and the Majorana fermion, as well as explore pathways to possible future platforms for topological quantum computing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| α-PdBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.7 | Pressure not reported | onset |
| α-PdBi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | unknown |
| β-PdBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.3 | Pressure not reported | unknown |
Similar papers
Unusual Dirac Fermions on the Surface of a Noncentrosymmetric α-BiPd Superconductor
similarity 0.94S. Thirupathaiah et al.
Source status unknown — claims are unverified
Probing the superconducting gap symmetry of α−PdBi2: A penetration depth study
similarity 0.94S. Mitra et al.
Source status unknown — claims are unverified
Unconventional magnetization in the multiphase superconductor PdBi2
similarity 0.93Wenjun Kuang et al.
Source status unknown — claims are unverified
Fully gapped superconductivity in the topological superconductor β−PdBi2
similarity 0.93P. K. Biswas et al.
Source status unknown — claims are unverified
Large spin to charge conversion in the topological superconductor β−PdBi2 at room temperature
similarity 0.93Yang Li et al.
Source status unknown — claims are unverified
Dirac fermions in the layered titanium-based oxypnictide superconductor BaTi2Bi2O
similarity 0.92Xianbiao Shi et al.
Source status unknown — claims are unverified